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Question 49 - JN0-351 discussion

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Which two mechanisms are part of building and maintaining a Layer 2 bridge table? (Choose two.)

A.
blocking
Answers
A.
blocking
B.
flooding
Answers
B.
flooding
C.
learning
Answers
C.
learning
D.
listening
Answers
D.
listening
Suggested answer: B, C

Explanation:

Option B is correct.Flooding is a mechanism used in Layer 2 bridging where the switch sends incoming packets to all its ports except for the port where the packet originated1.This is done when the switch doesn't know the destination MAC address or when the packet is a broadcast or multicast1.

Option C is correct.Learning is another mechanism used in Layer 2 bridging where the switch learns the source MAC addresses of incoming packets and associates them with the port on which they were received23.This information is stored in a MAC address table, also known as a bridge table23.

Option A is incorrect.Blocking is a state in Spanning Tree Protocol (STP) used to prevent loops in a network2.It's not a mechanism used in building and maintaining a Layer 2 bridge table2.

Option D is incorrect.Listening is also a state in Spanning Tree Protocol (STP) where the switch listens for BPDUs to make sure no loops occur in the network before transitioning to the learning state2.It's not a mechanism used in building and maintaining a Layer 2 bridge table2.

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asked 18/09/2024
Martijn Lammerts
43 questions
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